Cavitation at grain and phase boundaries during superplastic flow of an aluminum bronze

Dunlop, G. L.; Shapiro, E. Ya.; Taplin, D. M. R.; Crane, J.

doi:10.1007/bf02643265

Cited by 46 publications

(6 citation statements)

References 14 publications

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“…[22][23][24][25] Cavities often grow during grain boundary sliding, resulting in premature fracture. Therefore, it is worthwhile to investigate cavitation for understanding of the low elongation of the solid recycled specimen.…”

Section: à1=2mentioning

confidence: 99%

Corrosion and Mechanical Properties of Recycled 5083 Aluminum Alloy by Solid State Recycling

et al. 2003

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Corrosion and Mechanical properties of a recycled 5083 aluminum alloy by solid state recycling have been compared with those of a virgin extrusion which was processed from the ingot block. In the solid state recycling, the machined chips were extruded at 723 K with an extrusion ratio of 44 : 1 in air. As a result of the salt immersion tests, the mass loss of the solid recycled specimen was not less than twice of that of the virgin extruded specimen. The deterioration in corrosion properties for the solid recycled specimen was attributed to the excessive contamination of iron which promoted galvanic corrosion. As a result of tensile tests, the solid recycled specimen exhibited a good combination of high strength and high elongation to failure at room temperature. The excellent mechanical properties for the solid recycled specimen were attributed to the refined microstructure. However, the elongation to failure of the solid recycled specimen at elevated temperatures more than 573 K was lower than that of the virgin extruded specimen. The contamination of oxide particles is likely to be responsible for the lower elongation in the solid recycled specimen.

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Section: à1=2mentioning

confidence: 99%

Corrosion and Mechanical Properties of Recycled 5083 Aluminum Alloy by Solid State Recycling

et al. 2003

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“…In general, cavities are formed at grain boundaries in superplastic materials because cavity formation is attributed to stress concentration caused by grain boundary sliding. [25][26][27][28] For the solid recycled specimen, however, cavities were observed in the interior of grains as well as at grain boundaries. Watanabe et al 20) noted that dislocation movement in the interior of grains plays an important role in accommodating grain boundary sliding in superplastic magnesium alloys.…”

Section: Cavitationmentioning

confidence: 99%

“…Cavitation is often observed in a wide range of superplastic materials. [25][26][27][28] Cavities grow during straining, resulting in premature fracture. When cavity growth is strain-controlled, the volume of cavities increases exponentially with strain.…”

Section: Cavitationmentioning

confidence: 99%

Superplasticity and Cavitation of Recycled AZ31 Magnesium Alloy Fabricated by Solid Recycling Process

et al. 2002

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Superplastic behavior and cavitation have been investigated for the solid recycled AZ31 magnesium alloy made of machined chips. The elongation to failure of the solid recycled specimen was lower than that for the extruded specimen from a virgin block (virgin extruded specimen) at elevated temperature, although the strain rate sensitivity for the solid recycled specimen was the same as that for the virgin extruded specimen. The volume fraction of cavities and the total number of cavities for the solid recycled specimen were larger than those for the virgin extruded specimen. Moreover, cavity nucleation occurred not only at grain boundaries, but also in the grains for the solid recycled specimen. It is suggested that contamination of oxide particles at grain boundaries and in grains promotes cavity nucleation in the solid recycled specimen and adversely affects the elongation to failure.

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“…-Grain growth has been considered so far as the only phenomenon taking place during pseudo-steadystate flow. However, on many superplastic alloys, an uniformly distributed damage appears [30,33,39,66,[81][82][83]. Plastic stability studies have shown that microvoid generation during deformation increases the instability by decreasing the strain rate sensitivity of the stress [70].…”

mentioning

confidence: 99%

Rheological and metallurgical discussion of superplastic behaviour

Suéry¹,

Baudelet²

1978

Rev. Phys. Appl. (Paris)

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The analysis of the deformation of superplastic materials shows that the structure tends to evolve towards an equiaxed state and to undergo grain growth. This behaviour influences the constitutive equations : apparent strain-hardening, sigmoidal variation of the Log stress- Log strain rate curve, low apparent activation energy values at intermediate strain rates. This deformation behaviour can be explained when the structural change is taken into account. The analysis described leads to a constitutive equation which presents a metallurgical basis since it takes into account the structural changes. By contrast, the generally proposed relationship is rheological and can be used only within a strictly mechanical approach. An hydrodynamic analogy of superplastic flow is then presented. It shows that superplasticity occurs, on the one hand when the hardest phase is not continuous, and on the other hand when the most ductile phase has a mean free path no greater than a few microns. The analogy also demonstrates that the textural evolution is different for the two phases and accounts for the observed interface sliding. Furthermore, this study suggests that superplastic behaviour with elevated values of the coefficient m can be observed, although large elongations cannot be obtained in cases where the material undergoes cavitation resulting from difficulties in interface sliding

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Cavitation at grain and phase boundaries during superplastic flow of an aluminum bronze

Cited by 46 publications

References 14 publications

Corrosion and Mechanical Properties of Recycled 5083 Aluminum Alloy by Solid State Recycling

Corrosion and Mechanical Properties of Recycled 5083 Aluminum Alloy by Solid State Recycling

Superplasticity and Cavitation of Recycled AZ31 Magnesium Alloy Fabricated by Solid Recycling Process

Rheological and metallurgical discussion of superplastic behaviour

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